Pipe-threading tool.



J. B. PHILLIPS PIPE THREADING TOOL.

APPLICATION FILED APR. 26, 1915.

1,169,507, Patented Jan. 25, 1916.

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UNTTEE TATE PATENT @FFTQE JOHN B. PHILLIPS, OF VIARREN, OHIO, ASSIGNOR TO THE BURDEN COMPANY, OF WARREN, OHIO, A CORPORATION OF OHIO.

PIPE-TI-IBEADING TOOL.

Application filed. April 28, 1915.

To all whom it may concern:

Be it known that I, J OHN B. PHILLIPS, oi lVarren, in the county of Trumbull and State of Ohio, have invented certain new and useful Improvements in Pipe-Threading Tools; and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In Letters Patent of the United States No. 1,076,188 of October 21, 1913, there is shown and described a thread cutting tool of the type commonly known as cross bar, that is, one wherein the use of work-holders and lead screws is unknown, the recession of the chasers being controlled by a stop with which the pipe engages and side posts cooperating with the chaser-engaging plate.

In threading tools of the type referred to when the recession of the chasers is not effected by the pressure of the work, the rotation of the chaserengaging plate, independently of its rotation with the chaser-carrier, is caused by a single diagonal wall on one of the side posts, and hence as pointed out in said patent by cutting away the opposite diagonal side wall of the post the chasers may be thrown out by manually turning the cam plate.

The object of my present invention is to provide in a pipe-threading tool having the characteristics above outlined, means for automatically re-positioning the thrown out chasers at the end of each operation by the act of restoring the stop and posts to their starting points.-

In the accompanying drawings, Figure l is a plan view. Fig. 2 is an enlarged View on line 2-2, Fig. 1, the parts being shown in full lines in the positions they occupy at the beginning of the cutting operation and in dotted lines as they are, after the cutting operation has partially progressed. Fig. 3 is a similar view showing the extreme limit of travel of the chaser-carrier. Fig. 4 is a detail view.

Referring to the drawings, 1 designates a chaser-carrier which may be provided with the usual manipulating handles; 2 the series Specification of Letters Patent.

Patented J an. 25, 1916.

Serial No. 23,901.

trally disposed stop with which the pipe is designed to engage; 7 the cross bar upon which the stop is mounted; and 8 the side posts which lit in openings in the housing or chaser-carrier. Detailed description is unnecessary in view of the patent before noted.

I have shown each of the side posts as having a single diagonal wall 9, but it is not necessary to provide both posts with such walls as one will sutlice. These diagonal walls are designed to engage lugs 10 ot' the second plate 4: and to cause the rotation of the chaser-engaging plate and thereby the recession of the chaser-s. I

.F or the purpose of insuring the return of the chasers to their starting points when they are to cut a second thread on pipe of the same size as that for'which they were previously adjusted, I provide one of the posts 8 with a trigger 12 which is pivoted at its upper end to the inner face of the post, and in its normal position one side is parallel with the diagonal wall 9. The latter has a cut away 13 to accommodate lower angular portion ll of the trigger. At the beginning of the cutting operation the trigger occupies the position shown in full lines in Fig. :2, and is so held by the bore in the housing formed to accommodate the side post to which the trigger is secured. This bore is cut away at 15 and has an inclined surface which is coincident with the inner end of a curved lug l7 detachably secured to the housing or chasercarrier. In the beginning or" the threading operation the lug of the second plate is firmly held between the opposed parallel faces of the diagonal wall 9 and the trigger. After one or two revolutions of the tool, and during which a relative longitudinal movement has occurred between the chaser-carrier and the side posts, the trigger at its inner end is in line with the cut away 15. The trigger is then exerting no influence whatsoever on the cam-plate, or the lug of the plate carried thereby, all the work being done by the diagonal wall 9.

At or before the'completion of the threadcutting operation the operator may throw out the chasers from the work by manually turning the chaser-engaging plate and the plate carried thereby. The trigger not only permits the throw out'of the chasers, but after the tool has been repositioned on another pipe of the same diameter as the one previously threaded, the act of moving inwardly the cross-bar, the stop aidthe 'side posts, will automatically restore the chasers to the starting point, since the engagement of the lower end of the trigger with the curved face of the lug 17 and the coincident curve in the housing will force the trigger inwardly, and its engagement with the lug will effect the turning'of the chaser-engaging plate and hence the restoration of the chasers to their starting points. In other words, after the tool has been once set for cutting pipe of a given size the chasers may be manually thrown out at the end of the cutting operation, or previously thereto, if desired, and automatically restored totheir starting points by the act of returning the cross-bar and its-adjuncts to their initial position. WVhcn the trigger is swung laterally by the opening of the chasers, that is, by the manual turning of the chaser-engaging plate, its lower end will be in line to engage the curved surface of the lug orhousing so as to insure the turning of the chaser-engaging plate and the inward movement of the chasers as the controlling parts are restored to their original positions.

I claim as my invention:

1. In a tool for cutting tapered threads, a rotatable and longitudinally movable chasercarrier, a series of radially arranged chasers, a single element common to all the chasers and rotatable with and independently of said chaser-carrier, means rotatable with the chaser-carrier, but not partaking of the longitudinal travel thereof, for causing the independent rotation of such chaser-engaging element and constructed to permit the latter to be moved to throw the chasers outwardly after or during the cutting operation after said element has been moved independently of its rotation of the chaser-carrier, and means for automatically returning the chasers to their startingpoints as the last mentioned means is returned to its normal position.

2. In a tool for cutting tapered threads, the combination with a rotatable and longitudinally movable chaser-carrier, of a series of chasers mounted in the carrier, a chaser-engaging plate rotatable with and independently of said chasercarrier, said plate having a lateral projection, a post rotatable with the chaser-carrier, but not partaking of the longitudinal travel thereof, said post having a diagonal wall with which said projection is designed to engage and by which the plate is forced in the direction to effect the recession of the chasers, said plate being capable of being turned to throw the chasers outwardly at any point during the cutting operation, and means for automa tically restoring the chasers to their normal positions as the post and chaser-carrier resume their initial positions.

8. In a tool for cutting tapered threads,

the recession of the chasers, said plate being capable of being turned to throw the chasers outwardly at any point during the cutting operation, and an element pivoted to said post for engaging said lateral projection-to return said plate and chasers to their normal positions as the post, and chaser-carrier resum'eetheir initial positions.

4. In a tool for cutting tapered threads, the combination with a rotatable and longitudinally movable chaser-carrier, of a series of chasers mounted in the carrier, a chaserengaging plate rotatable with and independently of said chaser-carrier, said plate hav-;

ing a'lateral projection, a post rotatable with the chaser-carrier, but not'partaking of the longitudinal travel thereof, said post having a diagonal wall with which said projection is designed to engage and by which the plate is forced in the direction to effect the recession of the chasers, said plate being capable of being turned to throw the chasers outwardly at any point during the cutting operation, a pivoted element carried by said post for engaging said lateral projection, and means mounted on the carrier for causing said element to return the chaserengaging plate and the chasers to their normal positions.

5. In a tool for cutting tapered threads, the combination with a rotatable'and longitudinally movable chaser-carrier, of a series of chasers mounted in the carrier, a chaser-engaging plate rotatable with and independently of said chaser-carrier, said plate having a lateral projection, a post rotatable withthe chaser-carrier, but not partaking of the longitudinal travel thereof,

said post having a diagonal wall with which said projection is designed to engage and by which the plate is forced in the direction to effect the recession of the chasers, a trigger pivoted to said post and designed to parallel said diagonal'wall duringrthe starting of the threading operation, said trigger'being capable of being moved laterally when the chaser-engaging plate is turned to throw the chasers outwardly, and means acting on said trigger to return the chasers and the chaserengaging plate to their starting position when the post and chaser-carrier are returned to their initial positions. 7

6, In a tool for cutting tapered threads, the combination of a rotatable and longiiio tudinally movable chaser-carrier having a socket and an inclined portion intersecting said socket, of a series of chasers mounted in the carrier, a chaser-engaging plate rotatable with and independently of said chasercarrier, but not partaking of the longitudinal travel thereof, said post fitting in said socket and having a diagonal wall with which said projection is designed to engage and by which the plate is forced in the di rection to effect the recession of the chasers, and a trigger pivoted to said post and designed to engage said lateral projection and specification in the presence of two sub- 20 scribing witnesses.

JOHN B. PHILLIPS.

Witnesses:

I. B. TAYLOR, J. J. ZEiTZ.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents. Washington, D. C. 

